Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Effecting a change in a polymerization process in response...
Patent
1975-05-19
1977-05-31
Holler, Alan
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Effecting a change in a polymerization process in response...
526 64, C08F 1002
Patent
active
040270858
ABSTRACT:
In apparatus for polymerizing high-pressure ethylene to produce polyethylene, a tubular reactor is connected to a source of solution to the tubular reactor. This solution includes one or more catalysts which promote the polymerization reaction. Within the tubular reactor, a peak temperature occurs in proximity of the point at which the catalysts are introduced. If the catalysts are introduced at more than one point, peak temperatures will result downstream of each of such points. For various reasons, the peak temperatures are displaced along the tubular reactor and a plurality of thermocouples are distributed at spaced positions in the tubular reactor to measure the temperatures at the positions at which the peak temperature might occur. These thermocouples generate signals which are fed into a gating arrangement which selects the peak signal which is compared in a comparator circuit with an adjustable or selectable signal representative of the peak temperature which is desired. A difference signal is generated which relates to the difference between the selected signal and the peak signal with which it is compared. This difference signal is converted by a transducer into a pressure signal which is fed to a control valve which controls the speed of operation of a pump feeding the catalysts into the reactor. If two or more pumps are employed for feeding the catalysts into different zones in the reactor, separate controls are provided for each of the pumps.
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patent: 3299033 (1967-01-01), Douglas
Alcorn, III Ward C.
Clemmer Clyde C.
Brennan Bryant W.
Collins Arthur S.
Dart Industries Inc.
Holler Alan
Valles Fred S.
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